BMC Medical Imaging

Table 4 The correlation between the heterogeneity rankings computed via various statistics and that done independently by the veteran oncologist was quantified via the Spearman rank test

From: Quantification of heterogeneity observed in medical images

					Ranking statistic
Set	Images	Area (px)	ζ	Variance	Entropy	Energy	Contrast	Homogeneity
A	7	0–30	0.015	0.305	0.361	0.361	0.164	0.164
B	7	30–50	0.100	0.050	0.333	0.333	0.015	0.305
C	7	50–75	0.003	0.228	0.305	0.389	0.005	0.185
D	6	50–75	0.003	0.250	0.220	0.288	0.190	0.160
E	8	75–100	0.003	0.327	0.481	0.134	0.090	0.167
F	6	100-125	0.083	0.327	0.250	0.220	0.481	0.220
G	6	125–300	0.050	0.288	0.160	0.250	0.083	0.083
Mean			0.04±0.02	0.25±0.04	0.30±0.04	0.28±0.03	0.15±0.06	0.18±0.03

The p-values given in columns 4–9 represent the likelihood that observed correlations are due entirely to random chance.

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